Force all visitors to login before accessing your wordpress site and add a message on the login screen explaining that login is required.
This is a very simple plugin that will check to see if a visitor is logged in before allowed your WordPress site to be displayed.
If they are not it will display the login page of your site. It will also add text on the login page to explain that the site
required all visitors to login.
wp_passprotect.php
to the /wp-content/plugins/password-protect-plugin-for-wordpress/
directoryYes, under the settings screen.
You may have a conflict with that plugin.